adds test algo schema closure

src/main/kotlin/unibz.cs.semint.kprime/domain/ddl/Schema.kt

@@ -119,9 +119,9 @@ class Schema () {
             return keys
         }
 
-        fun closure(attrs: Set<Column>,fds:Set<Constraint>): Set<Column> {
+        fun closure(attrs: Set<Column>, fds:Set<Constraint>): Set<Column> {
             val result = HashSet<Column>(attrs)
-            //println("RESULT = $result")
+            //println("RESULT X = $result")
             var found = true
             while(found) {
                 found= false

src/test/kotlin/unibz.cs.semint.kprime/domain/ConstraintTest.kt

@@ -40,4 +40,13 @@ class ConstraintTest {
                 keys.toString()
         )
     }
+
+    @Test
+    fun test_closure() {
+        val columns = Column.set("C,S")
+        val constraints = Constraint.set("C-->T;H,R-->C;H,T-->R;C,S-->G;H,S-->R")
+
+        val closure = Schema.closure(columns, constraints)
+        println(closure)
+    }
 }
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